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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9abcf319cf7a487d5e2592947a53dc715195ba8de999a66b036df91c00b7f02d' 
  AND token = 'AzGX2Ib9VL3m+8nrUHZNTsbjHmDTakHepBlwh017nVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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