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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5dc0b98316026cfea4d269a3edad247c9a5dc0e39ce7d1594963b0b2016f004' 
  AND token = 'zR0b5aPIRJCEJGIGodsUGGKeWZ3eJattGcnLc7F3GL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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