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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e123efedef71f34a8d943efd7b4ad89e8904d4e995015cf4c817d484eedd9a76' 
  AND token = 'cniCAPOWA6l6ylUDAzQutIKi4Warsy9S7sIsImCcgv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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