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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ebe940828e06b4a4d30a1775db93576ad4d22a4b4f8c65d75e1a1993a44a989' 
  AND token = 'WBY/uu+RrXsrxpH/0p4CpoCWm7/UGMUoG0c3aF6iVyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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