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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec939c0fc483395ab9c01f56a91c457bf07a158e85117e1a146747bc88716df4' 
  AND token = '+G46tTFzwhH99BVfAKNm3AvLP3LpaUHDRSLMTRCOrEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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