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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0511c0452d6f02de94ef801b3dd023c7b4b3dff35fe4bf349af80f7ce18d5a2' 
  AND token = 'a/P/YSO3La1OShAWXuXjY2Ozh9cl2VfaGLGI3M8T13I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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