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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a1d92117ef0a647508ef320cde2a8ff00ead4a1d1230fef970a61fd485efdf9' 
  AND token = '1WLY5mNqzuEPvFOHy1BH2TsxhWvqWBYxV1EcNPQqpG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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