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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fd1198793671e93641112d72241abdf5749b9f7ced835db6a73de1785b1d5a1' 
  AND token = 'qSlcjzjyjTH+eoHkn1xpYAUU1yoJC5XylF6c78/XC9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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