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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd1fda9b5cf06d0d8ee4fb9bc0e54c73a5a246b2d6e3104ee2d191311dd40765' 
  AND token = 'BlyruH+OnXxCfcdCPbLpVaPSRlS9ZGE6dPqQ/JD3fKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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