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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c376a7a34720caf8ba27fe842f39f5fb759221796276746ed8c2a7d9c08f881' 
  AND token = 'WTITjwXoGuaSTEHk3CG2X+VRd6wGaYYIXx7GFt/qosk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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