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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89c5792b34c89d2a2202834dae97417afe39ce9bc0a67dfae4fcbcd13d50d5a1' 
  AND token = 'ygHz/Xpmd2Kiu3N8GKbCTfdN8qwf27MMJ0owE7mGqJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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