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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb06c93d52c0b395aff8101f3fec71982d94c65a00f6ec24b0c7659666a58519' 
  AND token = 'sbFZfNHU3kU3z9MxFdTAlD+LNju6ScDvmctvwkJ/lIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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