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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0c5511150aac21485a33c671b2f3e68d29a5853c062fb706570867b5f2ccfaf' 
  AND token = 'yZJJrz6F/Q5Vr1VTEf/UXRXem8EZI2DAABcsd1VFESA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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