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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e5d0dd6e709e4aa5813f703c8f6906f18dc5a0bac92436d8d9746c20c4f1692' 
  AND token = '1MDPVn082xQy0vjjLgtGOBJoC0Pg8eoXNHhFkZWT8A8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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