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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b97daf38bff01f17c3746812c3186b2cdfca56197fd8eff6c1076ce4a5718031' 
  AND token = 'IeFg1XOy0AwMFAmmT3JG2l9RVo53i5j99RpTdsUn0zk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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