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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd4a26c0e87a1218d3b80efbec097214c10bd66f7de96e9d043ab294b544b2a0' 
  AND token = 'xHtet+F6yab+xtj4TY03tCSs5fkEcJhYrDlUV7947yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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