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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c1e60ac5bec83722d365fb947ce2724daeac71cdeff6321ccdd62297e4603ee' 
  AND token = 'Numm4anzHF2ba2/x9x2j3HKKXRSN/6w8alkA3BWFw1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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