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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c0fbbf9cd701faf0d5d348bd3cc7ba4b7cf2aebad4e1ab81566be895c19eee8' 
  AND token = 'PT07gxsFbAkyD1mQhmMOlGWTha6pgFawxNLw5Gndveg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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