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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a970780677b9f442292499fd0947d4b2d10561f464aa4b149077742fa4e7622' 
  AND token = '2/tLvWhY2mE/PfKMG5GmQ7r/gfvFeK20H5qW3/kcPNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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