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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3df1ed2bdb187b48547ef5206b20c8999163d4bab15bbb82c9e2bf53b807150e' 
  AND token = 'eKA2Gmrxc4zQc8OBDe7gUg3XDT56GGfNP5cCOSe7JwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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