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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31089b2be6e095688778fb99135f2ad15900e59607a0b02d1665d93b2ffd2ff1' 
  AND token = 'oarGpi2WNo0RPB8S7l7n911kX1QIdNVo4ItyejwpLvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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