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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a170623270e35081bc820593c19174838e948a5250580a422c30f716a1ae37be' 
  AND token = 'A/ikh2Bt4rkhDFafzo9hkwqgj252qK3Z5jA6uP+2TRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00076

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}