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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66bfc6dc1cc5bd1fb1233cc0b9b1625e018ba461bcc5a7f667f7b1f09da77173' 
  AND token = 'MU7Gv4YMYcIB1UQrjzrE+1oNsGnArJQYBteNGXmHqrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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