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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5223fc344b604fca3144a3e789351c7e3f521dcb398679e14a018c7253e2e44d' 
  AND token = 'k3CQvT3hleF+R/1VfMLF2PZW0CqyrbMeLJyMB0OeBIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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