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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f013b023b4de748afca8ea23ed05ca113c009059203cf345c5ef27984d6f74b' 
  AND token = '51c8h65D9bF2bI3rERI5uPtYTi4FC+vduYwYCfCmQhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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