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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec6369bbdcf23f102d71843c719bd39ff88f9c480564de89d1655495c95c9cf2' 
  AND token = 'WlvSUgq3DaDwECu0BUGvXZ34avhrtT8N4clJAdlLDmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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