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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecea6012fc7b07dd8654458f13bb33a3d49fdf278cd631cdb102954107755275' 
  AND token = '+zAhgo0awriNVg/3Xqa3haPnllT7qUvRgI3cWrL6U1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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