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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66993af9376fcd4da2923748979a9e630915f73167dd03ceb8cf7f4d4468360c' 
  AND token = 'GEJgSwmHsJMHmHwFiEt6T0K0gIBUm7JqiZAdE/FvAKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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