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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d72adb9689e3f2c9cb04c0a4a1af44f23df8c1682d3777a5dd369b3cb559cfe' 
  AND token = 'Z5Tmg3zyUpvbMq1+hsctoFI6QqAruqy2ZNi8UhsAC3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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