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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '893f1d7a9e7060a5e64fc2cb235d72d1e1c41bbe6a0c9a8dbcbc0660f833f8a5' 
  AND token = '4OpxBIVEL+bwbfWaVzKoWltE1hEPvEls9SJq7wTklCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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