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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e31f5796eb5b30378e8a6c81cb82d65f7b3a95f21e0e83f4b499bd14e7a0d2b' 
  AND token = 'PPSvv4Qjiov/p6FHoLNFPf7pe9cN4mZCcqE+SVad2pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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