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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '207790ee9603c58f2aa2125391ff7ec9183abd08d957bdb64eb1b147f87650bd' 
  AND token = 'jgh2n6krReMWhwXHQPH0cA/PPrR7h5DIzWuAKlnKr+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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