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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd197831db90f354a0e6f20dd3c589cd033f1b03723738eed84021fa93d08218' 
  AND token = '4g+vemWjE035mdTlQWD6s9eUAS0x1Iz5eraKqiuycG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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