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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b06e7e8cd24171ef2699cbecfcae36f2169de7c6fa5400165cf65cf78d60bcbe' 
  AND token = '4IoJA1i/3c+RP5BYw3AYvie8J862kju6TUMnz2NNS94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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