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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16a649b1ca3f6a6129646cee5e5a1b930f3fac69fcfd53183f9b90b373120917' 
  AND token = '8ee4DwIRLtzgDGa51CPda+ZruGmS+51UW66BgXaMRR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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