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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90907c6034fdb7440e6903bebe7d82b908c114e742d6869b31cd6fe727f0439a' 
  AND token = '9bkdv1h3Ys+buX/vGc45GBlVJs7LML3EP4/n6mzT/mY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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