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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9eb028063bde95e51f2702166974ebdbdfde7dcc8b290a0b05d443dffca0c2bf' 
  AND token = 'rqVjd+89Q2vVBY7J0E+EbYBdTgygh6/Pto/yyeV3ito=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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