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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d75d3966fdc65c03c216652a1ccf0c3e48be5d927ee51afde37b67e78de60ce' 
  AND token = '3/CU4KD/qN2Fz/rCC59S4p3ids/r36uvqrZtKUJjn4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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