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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e56b23f2c2b1adddb1eac1140bbb2efa8fa585e0489431ec59621f136d8c130' 
  AND token = 'LzqsHPRJD+gonngEewvPss/LE6yHUaMn8+fpXM2Bdls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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