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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18b3478ee703f4dcf47cbef1b74d5cea4570365eba040284f28e8b8078667b47' 
  AND token = 'HVmAGGLhvdKPBX0chfpBk0Kcqak8pd6bFBsd1nxrXmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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