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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85a902621ffe54b086d807bceea9af0af9c52f9865c424edd40e785acf3f5017' 
  AND token = 'TrFmfWeskJ6u4u2tzihqrHFk2pn1qxks8Nf95z2D4hs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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