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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddc3cb12200a5ba68351f9e13340151894c061ae2efdc831d964160a8d41ffa8' 
  AND token = 'T07UvYRT00ciiAC0ztdOdJ2DYrk6O4bnZGVHEijcD2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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