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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c63c5a4f7892a1523fd0f9c295633bb63d4a06094562b39d8a4fc11a767a328b' 
  AND token = '0Ml2aM1cpRTOjIRf799E/7eiej8SVmg//qw/QGHsmJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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