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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a38f35100a0f2dea940835c80ba24dc134e66131f0058dba026dafd0fd1ecae8' 
  AND token = 'yXsjHTgMVevOvW1OyNCfzYbwIJowVgFC85SFTWNlqDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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