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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '772e79efdb3202ddffbe3bf9d513835e21ff918931343f41f483dca426c7c9ef' 
  AND token = 'E/ijYcgZv05VsEQGojR9w9QIdneyQZe0eMFVT23qFQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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