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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f02172a5c2881a494ccf74b8745bb03aee807ad27244041d2b4cac68be2c5c28' 
  AND token = '3Eiu60rTR8Fseb0r/yGbrA2sGMDSZAyddY8hbc+nMU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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